Anyone here use filters for their landscape photography and if so which kind -screw on or the large squarish slide in format and any recommendations such as best place to purchase from with good international postage.
I have researched a bit but it seems most of the good stuff is from the UK or USA.
regards
Steve.

For grad ND fitler the square with the filter mount works best, as you can affect different part of the frame. Also you can affect different part of the frame with different colors as well. The circular ones does not allow for as much fine tuning.

The circular polarizing filters are useful to increase or decrease glare off water or to make the sky more blue. Handy to have sometimes.